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Code Issues Releases Wiki Activity

Simplified promise rejection handling

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This commit is contained in:
Bryan Roe
2020-08-10 23:42:34 -07:00
parent 03e4d3719f
commit 68fe2d9ad0
2 changed files with 51 additions and 63 deletions
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112
modules/promise.js
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@@ -24,16 +24,6 @@ function getRootPromise(obj)
}
return (obj);
}
function getDepth(obj)
{
var count = 1;
while (obj.parentPromise)
{
++count;
obj = obj.parentPromise;
}
return (count);
}
function event_switcher_helper(desired_callee, target, forward)
{
@@ -67,8 +57,28 @@ function Promise(promiseFunc)
{
this._ObjectID = 'promise';
this.promise = this;
this._internal = { _ObjectID: 'promise.internal', promise: this, func: promiseFunc, completed: false, errors: false, completedArgs: [], rejStarted: false, rejCount: 0, depth: 0 };
this._internal = { _ObjectID: 'promise.internal', promise: this, func: promiseFunc, completed: false, errors: false, completedArgs: [], internalCount: 0, _up: null };
require('events').EventEmitter.call(this._internal);
Object.defineProperty(this, "parentPromise",
{
get: function () { return (this._up); },
set: function (value)
{
if (value != null && this._up == null)
{
// We are no longer an orphan
if (this._internal.uncaught != null)
{
clearImmediate(this._internal.uncaught);
this._internal.uncaught = null;
}
}
this._up = value;
}
});
this._internal.on('newListener', function (eventName, eventCallback)
{
//console.log('newListener', eventName, 'errors/' + this.errors + ' completed/' + this.completed);
@@ -82,30 +92,25 @@ function Promise(promiseFunc)
this.emit_returnValue('resolved', r);
}
}
if (eventName == 'rejected' && (eventCallback.internal == null || eventCallback.internal == false))
{
var rp = getRootPromise(this.promise);
rp._internal.external = true;
if (this.uncaught != null)
{
clearImmediate(this.uncaught);
this.uncaught = null;
}
if (rp._internal.uncaught != null)
{
clearImmediate(rp._internal.uncaught);
rp._internal.uncaught = null;
}
}
if (eventName == 'rejected' && this.errors && this.completed)
{
var rt = getRootPromise(this.promise);
var ch = rt;
var chx = 1;
var ncnt = 1;
while(ch)
{
if (ch._internal.listenerCount('rejected') > 0)
{
ncnt += ch._internal.listenerCount('rejected');
}
chx++;
ch = ch.__childPromise;
}
if (chx > rt._internal.depth) { rt._internal.depth = chx; }
if (ncnt > rt._internal.rejCount) { rt._internal.rejCount = ncnt; }
if (rt._internal._imm && rt._internal.rejCount >= rt._internal.depth)
{
clearImmediate(rt._internal._imm);
rt._internal._imm = null;
rt._internal._haltUncaught = true;
}
eventCallback.apply(this, this.completedArgs);
}
if (eventName == 'settled' && this.completed)
@@ -136,7 +141,6 @@ function Promise(promiseFunc)
if (args.length == 2 && args[1]!=null && typeof(args[1]) == 'object' && args[1]._ObjectID == 'promise')
{
var pr = getRootPromise(_resolver._self.promise);
pr._internal._haltUncaught = true;
args[1]._XSLF = _resolver._self;
args[1].then(function ()
{
@@ -150,7 +154,6 @@ function Promise(promiseFunc)
function (e)
{
this._XSLF.promise.__childPromise.parentPromise = null;
this._XSLF.promise.__childPromise._internal._haltUncaught = false;
this._XSLF.promise.__childPromise._rej(e);
//var parms = ['rejected', e];
//this._XSLF.emit.apply(this._XSLF, parms);
@@ -176,39 +179,22 @@ function Promise(promiseFunc)
}
var r = getRootPromise(_rejector._self.promise);
var me = false;
if (r._internal.rejStarted == false)
if ((r._internal.external == null || r._internal.external == false) && r._internal.uncaught == null)
{
r._internal.rejStarted = true;
r._internal.rejCount = 0;
r._internal.depth = 0;
me = true;
}
var d = getDepth(_rejector._self.promise);
if (d > r._internal.depth) { r._internal.depth = d; }
if (_rejector._self.listenerCount('rejected') > 0)
{
r._internal.rejCount += _rejector._self.listenerCount('rejected');
r._internal.uncaught = setImmediate(function (a)
{
process.emit('uncaughtException', 'promise.uncaughtRejection: ' + JSON.stringify(a));
}, arguments[0]);
}
_rejector._self.emit.apply(_rejector._self, args);
if (me)
{
r._internal.rejStarted = false;
if(r._internal.rejCount < r._internal.depth && !r._internal._imm && !r._internal._haltUncaught)
{
r._internal._imm = setImmediate(function (e, i) { i._imm = null; process.emit('uncaughtException', 'promise.uncaughtRejection: ' + e); }, args[1], r._internal);
}
}
_rejector._self.emit('settled');
};
this._internal.rejector.internal = true;
this.catch = function(func)
{
var rt = getRootPromise(this);
if (rt._internal._imm) { clearInterval(rt._internal._imm); rt._internal._imm = null; }
this._internal.once('rejected', event_switcher(this, func).func);
}
this.finally = function (func)
@@ -224,7 +210,7 @@ function Promise(promiseFunc)
}
var retVal = new Promise(function (r, j) { this._rej = j; });
retVal._internal._haltUncaught = true;
retVal.parentPromise = this;
if (this._internal.completed)
{
@@ -234,7 +220,9 @@ function Promise(promiseFunc)
{
if(rv._ObjectID == 'promise')
{
rv.parentPromise = this;
rv._internal.once('resolved', retVal._internal.resolver);
rv._internal.once('rejected', retVal._internal.rejector);
}
else
{
@@ -244,14 +232,14 @@ function Promise(promiseFunc)
else
{
this._internal.once('resolved', retVal._internal.resolver);
this._internal.once('rejected', retVal._internal.rejector);
}
}
else
{
this._internal.once('resolved', retVal._internal.resolver);
this._internal.once('rejected', retVal._internal.rejector);
}
this._internal.once('rejected', retVal._internal.rejector);
retVal.parentPromise = this;
this.__childPromise = retVal;
return (retVal);
};